When the Destiny's water supply mysteriously dwindles, Scott and Young are forced to explore an ice planet to replace the missing liquid. While they're gone, a mysterious swarm of creatures are discover and attack a crewman.

Recap

Greer and Riley are watching the water tanks when Young comes by and notes that the water levels are inexplicably dropping. He tells them not to let anyone in, including Spencer. Eli suggests that the water evaporated when they passed through the sun but Rush points out that it's a closed system. He warns that they have a serious problem and refuses to dial Earth now that the power reserves are full. Rush explains that the system is at 40% and when Young accuses him of lying, Eli explains he made the determination. Young tells Rush to bring Brody in on it...

Riley: Yeah, I read about these Chinese miners who survived a cave-in for six days by drinking their urine. Greer: I'm going to go ahead and pretend I didn't hear that.

Young: Well, where are we at then, Rush?Rush: Probably at less than 40% of original design capacity.Young: I can't tell when someone just pulls a number out of his ass.Rush: What?Eli: Uh, I actually pulled that number out of my ass.

Eli: It looks like we entered the Hoth system. (everyone stares) Empire Strikes Back? Second Star Wars movie? Okay, I refuse to call it Episode 5.

Eli: Okay, so now we've got aliens. What if they start bursting out of our stomachs?

Eli: Everyone is lying.Rush: Yeah, grownups do that sometimes.

Scott: How about you lower the gun down and I shoot myself free.Young: That's good thinking. There's no way the bullets will ricochet into your ass.

Young: Maybe there's a way for me to get down there.Scott: That's just as stupid.Young: "That's just as stupid, Sir."